Migrating Axis to Axis2

I'm working on an older Axis project, and some of the Java classes were generated from WSDL using the older WSDL2Java tool.
The problem now is, Java sees that as an error, since I have the latest Axis2 version 1.6.

I've been told to regenerate the Java classes from the the WSDL file using the WSDL2Java tool found in Axis2, however, the classes
generated are completely different to the older WSDL2Java.

How would I rework my way around this? I don't feel the project would work if I replace the older classes with the newer.